Possible chemical ? First Fet

I did a frozen medicated transfer on 7/7 and took a blood test on 9dpt5dt. It was a grade A embryo untested . Hcg was very low and came back at 16 . My home test had a very faint line on the same day . Today is 10 dpt and the line is still the same . No difference . I have already made up my mind that this is a chemical . I was asked not to stop meds and go in for another Beta . I have mild cramps . I am just praying that it should not be another ectopic as I had an ectopic which resulted in my tube removal before starting IVF . I had very light spotting yesterday but I am not sure if it is from taking vaginal progesterone